1. Department of Atmospheric Science; Colorado State University; Fort Collins; Colorado; USA
2. CSIRO Atmospheric Research; Aspendale; Victoria; Australia
3. Earth System Science; University of California, Irvine; Irvine; California; USA
4. National Center for Atmospheric Research; Boulder; Colorado; USA
5. Laboratoire des Sciences du Climate et de l'Environment; Gif-sur-Yvette; France
6. Climate Monitoring and Diagnostics Laboratory; NOAA; Boulder; Colorado; USA
7. Department of Earth, Atmospheric, and Planetary Science; Massachusetts Institute of Technology; Cambridge; Massachusetts; USA
8. Center for Atmospheric Sciences; University of California, Berkeley; Berkeley; California; USA
9. Max-Planck-Institute fur Biogeochemie; Jena; Germany
10. Quality Assurance Section, Atmospheric Environment Division, Observations Department; Japan Meteorological Agency; Tokyo; Japan
11. Institute for Global Change Research; Frontier Research System for Global Change; Yokohama; Japan
12. National Institute of Advanced Industrial Science and Technology; Ibaraki; Japan